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Stainless Power 1-7/8 in. Long Tube Catted Headers (15-17 GT w/ SW Cat-Back)

Market Price $1,408.97 You Save 12% ($162.09)
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  • Item 390795-A
  • MPN# SM15H3CAT

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    Features & Details

    • Increases Horsepower and Torque
    • Long Tube Header Design
    • High-Flow Catalytic Converters Included
    • 1-7/8" Primary Tubes with 3" Collector
    • Free Flowing Mandrel-Bent Tubing
    • 304 Stainless Steel Construction - Natural Finish
    • Intended for Off-Road, Track Use Only
    • Requires Stainless Works 3" Cat-Back Exhaust Part# 384843
    • 24-Month Guarantee on Material and Workmanship
    • Designed by Stainless Works
    • Fits Left Hand Drive Models Only
    • Fits 2015-2017 GT Mustangs with Stainless Works 3" Cat-Back
    More Horsepower and Torque. Are you on the a quest of more power to defeat your rivals whether you find them on the street, strip or at the track? If so, you should really lose those restrictive stock exhaust manifolds and replace them with a set of free flowing Stainless Power Long Tube Headers. Including a pair of high flow catalytic converters, these Stainless Power Headers feature venturi style merge spikes that optimize exhaust flow and improve scavenging. As a result, you will experience a dramatic increase in horse power and torque throughout the entire RPM range. Stainless Power's Long Tube Headers are the ideal choice for those Mustang owners that are looking for affordable high-end power.

    High Flow Catalytic Converters. Stainless Power's high flowing catalytic converters are engineered to outperform the restrictive stock cats. The included high flow catalytic converters provide a significant increase in exhaust flow for a measured improvement in horsepower and torque at the rear wheels.

    Superior Construction. Stainless Power Headers are manufactured to Stainless Works exact design specifications. Stainless Power Headers are CNC mandrel bent from 1-7/8" diameter, 304 stainless steel tubing for excellent exhaust flow and long lasting corrosion resistance. These Long Tube Headers feature TIG welded construction, as well as laser cut 3/8" header flanges for additional strength and leak-free performance.

    24-Month Guarantee. Stainless Power is Stainless Works value-line brand of exhaust products designed for the cost conscious consumer that wants a high-quality product at a reasonable price. Stainless Power is so confident in the quality of their Long Tube Headers that they are backed by a 24-Month guarantee on material and workmanship.

    Required Upgrade. To realize the full power potential that these Long Tube Catted Headers have to offer, AmericanMuscle recommends a Bama custom tune with a Mustang Handheld Tuner to reprogram the vehicles computer (ECU) for proper operation.

    Application. These Stainless Power Long Tube Catted Headers are specifically designed to fit the 2015 to 2017 GT Mustang equipped with the Coyote 5.0L DOHC V8 engine. Requires Stainless Works 3" cat-back exhaust system part# 384843 for proper installation.

    Technical Note. Not legal for use on pollution controlled motor vehicles; intended for off road use only.These Headers are intended for left hand drive applications only.

    Fitment: 2015 2016 2017 Details

    What's in the Box
    • (1) Driver Side Header
    • (1) Passenger Side Header
    • (1) Driver Side Connection Pipe
    • (1) Passenger Connection Pipe
    • (2) High-Flow Catalytic Converters
    • (4) Clamps
    • (2) O2 Extensions
    • Hardware
    Installation Info
    Tech Specs
    Header Specifications
    Header Type: Long Tube Type Mid Pipe Required: Requires Stainless Works cat-back exhaust part# 384843
    Material: Stainless Steel Finish: Natural
    Catalytic Converter: "Yes" - For off-road use only Fitment: 2015-2017 GT Mustangs
    Will it fit my Mustang?

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    3 Questions / 3 Answers

    Ask a Question

    Will this bolt up to borla 3" catback exhaust?


    • These Stainless Power Long Tube Catted Headers may work with a Borla 3" cat-back, however, they are specifically designed to be used with the Stainless Works 3" Cat-Back Exhaust Part# 384843.


    Helpful (0)

    Hi, will these headers work with a MBRP cat back exhaust with H-pipe (S7277BLK)? Thanks


    • The Stainless Power Long Tube Catted Headers - 1-7/8 in are designed to work with the Stainless Works 3 in Retro Chambered Cat-Back Exhaust w/ H-Pipe - Fastback (15-17 GT w/ Long Tube Headers), item # 384843, ( The MBRP Cat-Back may not be a direct bolt on to these Headers. It may require some custom work in order to have a proper install.


    Helpful (0)

    Would these fit correctly If I already have the MCB15 (384842)?


    • Unfortunately, the Stainless Works 3 in Retro Chambered Cat-Back Exhaust w/ H-Pipe - Fastback (15-17 GT), item # 384842, ( is designed to work with the factory exhaust manifolds. It does not work with aftermarket headers. These aftermarket Long Tube Headers will only work with the Stainless Works 3 in Retro Chambered Cat-Back Exhaust w/ H-Pipe - Fastback (15-17 GT w/ Long Tube Headers), item # 384843, (


    Helpful (0)

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    Customer Reviews (2) Write a Review

    Overall Rating 5

    out of 5 stars

    Installation Time:Full Day

    • Loudness / Volume 5 5
    • Exhaust Note 5 5
    • Fit & Finish 5 5
    • Bang For Your Buck 5 5

    • 5/5

      Installation Time: Full Day

      April 16, 2018


      High quality perfect fit . Highly satisfied with it..


      Year: 2016 Submodel: GT

      Helpful (1)

    • 5/5

      July 14, 2016

      Outstanding product

      Installed the stainless power long tube headers on my 2016 GT. Absolutely incredible sound and performance they produce! If you are looking for a set of long tubes these are absolutely no question best set for an affordable price!


      Year: 2016 Submodel: GT

      Helpful (3)

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